束的中心有一个管状的髓部，其中有类球形的髓细胞统松排列，常有气隙存在。
A cylindrical medulla is present in the centre of each bundle and packed loosely with roundish medulla cells.
它们将一束集中的光线反射到城镇的中心广场上，形成面积大约为600平方米的阳光区域。
They reflect a concentrated beam of light onto the town's central square, creating an area of sunlight roughly 600 square meters.
“它是一束小喷流，随后就逸散了。”美国国家大气研究中心高海拔观测站的太阳物理学家Scott McIntosh如是说。
"It's a little jet, then it takes off," said solar physicist Scott McIntosh of the National Center for Atmospheric Research's High Altitude Observatory.
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